You can try this if you want something different. I call this spec Shadowfrost 3.
https://wotlkdb.com/?talent#jZGMxtVr...dTfuz0k:LNbzmV
You have the pet of unholy along with CE for the burst, AMZ, AMS and Bone Shield for survivability.
You basically spam PS and IT, PS is mainly for the desecration procs, Icy Touch for the damage with KM and the rest of the frost talents. Reaping allows you to use 4 IT in a row, with the occasional Chains if you need it.
You can use 2 hand weap with Razorice, but imo dual wield is better for the extra rune and KM procs - Cinderglacier and Razorice on them.
You also get better rp generation for them DCs.
As a bonus you also have HC for some epic freezes.
The 1 pt in Epidemic is so that you can 3xDS with Reaping without your diseases falling off, while UB is so that healing with DS can be reliable.
Sort of a caster type spec, try it out.